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The acidity of a solution is measured by pH, defined as \(\text{pH} = -\log_{10}[H^+]\), where \([H^+]\) is the hydrogen ion concentration in moles per litre.
Calculate the pH of a solution with \([H^+] = 2.5 \times 10^{-4}\) mol/L.
Find the hydrogen ion concentration of a solution with a pH of 3.2.
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